Quote Originally Posted by 1gary View Post
Some of the GM trucks had multi tranny cross member holes for different trannies.If you either swapped the tranny for a different one or have that cross member in the wrong hole,that would effect the engine mounts.
Not sure how the trans mount would effect the engine mounts in the way he explains the problem..........If you have access to another truck I'd sure measure it and compare...ONE request when you figure this out post the answer cause there are a lot of us stumped..